How to debug the problems encountered in the shell script/program?

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How to get the last line from a file using just the terminal?

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how do you write sql queries using shell script for eg:- we have databae table like EMPNO,ENAME,SAL,DEPTNO columns in EMP table how you display EMPNO,SAL FIELDS from emp in SHELL SCRIPT please explain with an example

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What are the different types of variables used in shell script?

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How to print all the arguments provided to the script?

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give me some website where i can get unix and testing meterials

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What language is bash?

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wats the deinitions for shell utility and filter?

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What are the advantages of shell scripting?

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How to redirect both standard output and standard error to the same location?

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What are environment variables?

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I want to read all input to the command from file1 direct all output to file2 and error to file 3, how can I achieve this?

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